<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item, index) in goods" class="menu-item" :class="{'current': currentIndex === index}" @click.stop="selectMenu(index, $event)">
          <span class="text">
            <span v-show="item.type > 0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item" @click.stop="selectFood(food, $event)">
              <div class="icon">
                <img width="57" height="57" :src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food" @add-cart="_drop"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart ref="shopcart" :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
    <v-food :food="selectedFood" ref="food" @add="_drop"></v-food>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import shopcart from 'components/shopcart/shopcart';
  import cartcontrol from 'components/cartcontrol/cartcontrol';
  import food from 'components/food/food.vue';

  export default {
    components: {shopcart, cartcontrol, 'v-food': food},
    data () {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0,
        selectedFood: {}
      };
    },
    props: {
      seller: {type: Object}
    },
    computed: {
      currentIndex () {
        for (let i = 0, len = this.listHeight.length; i < len; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
            return i;
          }
        }
        return 0;
      },
      selectFoods () {
        let foods = [];
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) foods.push(food);
          });
        });
        return foods;
      }
    },
    methods: {
      selectMenu (index, event) {
        if (!event._constructed) return;
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let el = foodList[index];
        this.foodsScroll.scrollToElement(el, 300);
      },
      selectFood (food, event) {
        if (!event._constructed) return;
        this.selectedFood = food;
        this.$refs.food.show();
      },
      _drop (el) {
        this.$refs.shopcart.drop(el);
      },
      _initScroll () {
        this.menuScroll = new BScroll(this.$refs.menuWrapper, {click: true});
        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {click: true, probeType: 3});
        this.foodsScroll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y));
        });
      },
      _calculateHeight () {
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0, len = foodList.length; i < len; i++) {
          let item = foodList[i];
          height += item.clientHeight;
          this.listHeight.push(height);
        }
      }
    },
    created () {
      this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
      this.$http.get('/api/goods').then((res) => {
        let rd = res.data;
        if (rd.code === 0) {
          this.goods = rd.goods;
          this.$nextTick(() => {
            this._initScroll();
            this._calculateHeight();
          });
        }
      });
    }
  };
</script>

<style type="text/stylus" lang="stylus">
  @import "../../common/stylus/mixin.styl";
  .goods
    display: flex;
    position: absolute;
    top: 174px;
    bottom: 46px;
    width: 100%;
    overflow: hidden;
    .menu-wrapper
      flex: 0 0 80px;
      width: 80px;
      background-color: #f3f5f7;
      .menu-item
        display: table;
        height: 54px;
        width: 56px;
        padding: 0 12px;
        line-height: 14px;
        &.current
          position: relative;
          z-index: 10;
          margin-top: -1px;
          background-color: #fff;
          font-weight: 700;
          .text
            border-1px-none();
        .text
          display: table-cell;
          width: 56px;
          vertical-align: middle;
          border-1px(rgba(7, 17, 27, .1));
          font-size: 12px;
          .icon
            display: inline-block;
            vertical-align: top;
            width: 12px;
            height: 12px;
            margin-right: 2px;
            background-size: 12px 12px;
            background-repeat: no-repeat;
            &.decrease
              bg-image('decrease_3');
            &.discount
              bg-image('discount_3');
            &.guarantee
              bg-image('guarantee_3');
            &.invoice
              bg-image('invoice_3');
            &.special
              bg-image('special_3');
    .foods-wrapper
      flex: 1;
      .title
        padding-left: 14px;
        height: 26px;
        line-height: 26px;
        border-left: 2px solid #d9dde1;
        font-size: 12px;
        color: rgb(147, 153, 159);
        background-color: #f3f5f7;
      .food-item
        display: flex;
        margin: 18px;
        padding-bottom: 18px;
        border-1px(rgba(7, 17, 27, .1));
        &:last-child
          border-1px-none()
          margin-bottom: 0;
        .icon
          flex: 0 0 57px;
          margin-right: 10px;
        .content
          flex: 1;
          .name
            margin: 2px 0 8px 0;
            height: 14px;
            line-height: 14px;
            font-size: 14px;
            color: rgb(7, 17, 27);
          .desc, .extra
            font-size: 10px;
            color: rgb(147, 153, 159);
          .desc
            line-height: 12px;
            margin-bottom: 8px;
          .extra
            line-height: 10px;
            .count
              margin-right: 12px;
          .price
            font-weight: 700;
            line-height: 24px;
            .now
              margin-right: 8px;
              font-size: 14px;
              color: rgb(240, 20, 20);
            .old
              text-decoration: line-through;
              font-size: 10px;
              color: rgb(147, 153, 159);
          .cartcontrol-wrapper
            position: absolute;
            right: 0;
            bottom: 12px;
</style>
